Estimation
Round both numbers to the greatest place value and then add to find the estimated sum
32,916 and 6,830
30,000 + 7,000 = 37,000
3.2 + 16.62
19.82
Write the missing number
2/3 = x/27
x = 18
9.97 ÷ 10
0.997
What do the following words tell you about a problem?
sum
quotient
product
difference
answer to:
addition
division
multiplication
subtraction
Use mental math to solve the following: 70 x 9,000
630,000
18 - 9.4
8.6
reduce 16/24
2/3
0.4 ÷ 100
0.004
Name these parts: a/b
a is numerator
b is denominator
Round the factors to estimate the product of
42 x 29
40 x 30 = 1,200
13.6 x 0.33
4.488
add 4 and 1/7 + 2 and 5/7
add 4 and 1/7 + 2 and 6/7
6 and 6/7
7
52.31 ÷ 1000
0.05231
What shows a number in standard form?
a) 3000 + 200 + 10 + 6
b) 3,216
c) three thousand, two hundred and sixteen
b
Estimate 4.9 x 4.5
5 x 5 = 25
80 ÷ 3.2
25
1/4 + 1/6
5/12
43.7 ÷ 102
0.437
Tell me something in the room that is:
a) parallel
b) perpendicular
answers vary
Estimate 28.3 divided by 7.2 and 28.3 divided by 6
28 divided by 7 is 4
30 divided by 6 is 5
Put in order least to greatest:
3.07968, 3.728, 3.7286, 3.74
3.728, 3.74, 3.7286, 3.07968
What is the common denominator you would use to add: 1/4 + 5/6 + 1/12 + 3/8
24
0.198 ÷ 100
100 means 1, so the answer is 0.198
Define a prime number
Prime numbers are divisible only by 1 and themselves.